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Issue 12, 2017
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Wavelet-based interference correction for laser-induced breakdown spectroscopy

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Abstract

To minimize the impact of spectral interference on laser-induced breakdown spectroscopy (LIBS) quantitative analyses, an algorithm based on wavelet transform was developed for simultaneous correction of spectral interference and continuum background. The root-mean-square error of calibration (RMSEC) of the univariate regression model for the element of interest was applied to determine the wavelet function, decomposition level, and scaling factor α. When the interference-free analytical lines of the elements of interest cannot be directly obtained from the measured spectra, they can be extracted from the spectra with the developed method for quantitative analysis. This method was applied for LIBS analyses of chromium (Cr), silicon (Si), titanium (Ti), and manganese (Mn) with continuum backgrounds and spectral interference in low alloy steel samples. The root-mean-square errors of cross-validation (RMSECV) of elements Cr, Si, Ti, and Mn were 0.0295, 0.0140, 0.0183, and 0.0558 wt%, respectively. The results demonstrated that the developed algorithm contributed to accuracy improvement for LIBS quantitative analyses with the presence of spectral interference.

Graphical abstract: Wavelet-based interference correction for laser-induced breakdown spectroscopy

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Publication details

The article was received on 05 Jun 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7JA00204A
Citation: J. Anal. At. Spectrom., 2017,32, 2401-2406
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    Wavelet-based interference correction for laser-induced breakdown spectroscopy

    Y. M. Guo, L. M. Deng, X. Y. Yang, J. M. Li, K. H. Li, Z. H. Zhu, L. B. Guo, X. Y. Li, Y. F. Lu and X. Y. Zeng, J. Anal. At. Spectrom., 2017, 32, 2401
    DOI: 10.1039/C7JA00204A

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